Safety device



atent'ecl Aug. 51,1930

UNITED STATES PATENT .OFFICE j ING?.COIV.[II?ANY,` OF COLUMBUS, OHIO, A CORPORATION OFOHIO SAFETY Janvier.

Application'led December 8', 1925*, Serial No. 74,131. Renewed December 23, 1929.

The present invention relates to certain new and usefulumprovements in safety devices adapted to kprotect pulverizing machines from injuryV by fragments of unpulverizable material `which accidentally enter the machine with the material which is to be pulverized. f

The especial object of this inventionr is to provide, in a pulverizing machine ofthe revolving beater type, means 'to relieve the ab normal strains caused by the passage through the machine of fragments ofunpulverizable material.

The means whereby I attain this object are fully set forth inthe following specification, and`ill'ustrated-in the accompanying drawings of which- Fig. lis a transverse vertical sectional view of a pulverizing machine' equipped with the devices of my present invention.

Fig. 2 is a front elevation of the illustrated in Fig. 1..

Fig. 3 is a Vfragmentary sectional view, on an enlarged scale, of the machine illustrated inFigs. 1 and 2, showing the method of operation of thesafetydevices associated with the front wall of the `pulverizing chamber.

Like numerals referto similar parts in the several figures.V A

v In the drawings the numeral 1 refers to a rotor which is mounted upon a shaft 2 journaled in suitable bearings 3, and adapted to be actuated by rotative power derived from `any suitable and convenient 'source through the instrumentality of a belty `engaging the pulley 4. The rotorl 1 is provided with radially projecting arms 5 the ends of which generate, when the rotor revolves, a substantially continuous pulverizing surface upon which the material to be pulveri'zed may freely float. The journalV bearings 3 are preferably,formedintegral with or are attachedto the casing v6 which encloses the rotor, and this casing is adapted to be supported upon any convenient and suitable foundation. The upper part of the casing 6 comprises a pulverizing chamber 7-which is defined-by the end walls 8, lthe back wall 9 and the front wall 10. The back wall 9 `is preferably, though not necessarily, inclined machine to forin a hopper like chute down which the."

material which is to be pulverized may slide into contact with the pulverizing surface. f A cover plate 11 may, if desired, be provided to intercept flying fragments of material prov12'is the frontl wall 10 ofthe pulverizing chamber, and this wall is protected kfrom abrasion by the flying fragments of material `propelled from the pulverizing surface, by

the lining plate 13 at the lower end of which is formed a shelf like projection 14 which `entends into close proximity with the pulverizing surface to intercept the advancing turn them rearwardly of the pulverizing VsiluirrcnY n. ossiive, on COLUMBUS, onio, Assieivon To THE JEFFREY MANUFACTR- lfragments of unpulverized material and re- Y chamber.A At its lower end the front wall 10 is held in adjusted `relation with the `pul= verizing surface by the adjusting screws 15 which are screw threaded into suitable'nuts v16 attached to the casing. Each of the adjusting screws 15 is provided with two spaced apart collars 17 and 18vwhch engage ,the`

lower end of a lever 19 which is pivotally attached to the front wall 10 by a hinge kbolt,

20. rlhe lever 19 extends upwardly beyond wits pivotal4 attachment, and near its Lipper end `is pierced by a transverse aperture: 'through which projects arelatively fragile Y izingsurface, the strength of the pin 2l being sufficient to resist the strains of normal pulverizing service. `Vhen, however, an irreducible body, such as the steel hammer head `23, is'accidentally admitted to the pulverizing chamber, and is interposed between` the ends of the arms 5 and the shelf 14, as shown in Fig. 3, the pins 21, due to thefragile charthereby relieving the strain upon the machine and protecting the casing and rotor from destruction. After the hammerV head 23, or

other irreducible` object, is removed from' the pulverizingl chamber the front Wall 10 may be returned to its normal position, a new breakable-p-in 21 inserted inthe lever 19 and brackets 22, and the pulverizing action. proceeds aisbefore the interruption.

While I haveidiescribed my present inventionsr as. applied toV a pulverizing machine. of the Well known revolving beaterA type, it is apparent that" these: devices are applicable to other-typesof pulverizingmachines, and that thieJfrarmi and arrangement of the parts may subject. to:` Wide variationr Without departurewfroml thespirit of my' invention.

i WhatIclaimis i v i a '1. a pulverizing mill` the combination with a casing and a. rotorwithin the casing said @asin includino' a-V aulveriziney chamz: l t:

bergof an; abutm'entA at the forwardside of said pulvcrizingy chamber adjacent said rotor, alieverpivotally attached to said abutmerit', apositive member. adapted to be fractured by abnormal strains! arranged to prevent rotary-movement of said lever about its pivotal attachment, and means cooperating withsaid lever toadjust said abutment relativeto said` rotor as and for the purpose set fin-thiA Y 2, Inf a. pu'lverizing mill the` combination withy aras-ing and a rotor Within rthe casing said casing including a pulverizing chamber the forward Wall of which is pivotally supported at its-upper end and projects dovvnwardly into= proximity Withfsaid rotor, of a lever pivotally. attached to said Wall adjacent itsdewer; end, positive means including a member `adapted toibe fractured by abnormal"- strains: arranged to prevent movement od' saidj' lever about its pivotal attachment,

and means cooperating with said lever to adjust said Wall relative to said rotor as and forV th e: nurnose set forth.

In a pulverizing millthe combination with a casina and a rotor Withinthe` casing said casingincluding ak pulverizing chamber the: forward- Wall of WhichA is pivotallyy supported at itsk upper endand projects downwardly intoproximity with said rotor, of a leverv pivotally attached to said Wall adjacent its lower end,l a relatively fragile-mem-- ber: engagingsaid lever to prevent rotary movement about its pivotal attachment, and ascrew enga-ging' the free end of said lever to-fadjust said Wall relative to said rotor as andl for* theip-urpose set forth.

Ll. In combination, a frame element, a Wall element pivoted thereto, means subjecting said Wall element to operating impacts, a lever pivoted intermediate its ends to one of said elements, means on the other of said elements engaging one end of said lever, a member securing the other end of said liever in a determined position, said member being frangible under abnormal impact for perniittingr a swinging' of said" liever and acon- 75 said Wall element to operating impacts, a

lieverpivoted to one of said elements, means on the other of said elements engaging said leve-r, a member blockingsaid lever iii a determi-ned position, said member being frangile under abnormal impact for permitting aiA g5 'swinging of said leverfl and' a consequent yielding of said Wall element relativetosaid frame element.

6. In combination, a frame element, a Wall element pivoted thereto, means subjectingfi'o saidA Wall. element to operating impacts-,-a leve-r pivoted to one ofl said elements, means on the other of said elements for-engaging lever`v a member blocking said lever in yaf determined polsi-tion, said member being'- 95 trangiblel under abnormal impact for permitting a swinging of said levery and aA consequent` release of the latter from said engaging means, .whereby a yielding of said Wall element relative to said frame element is al-Llloo lowed. f

7. :In a machine of the class described, the

' combination of a casing, a rotor in said casing, saidcasingincluding a pivotally mounted ivalladjacent thepath'y o-f said rotor, and?. 105

latch means under abnormal strains, said; latchmeans-being disposed' at the portion of said pivotally mounted Wall subjected to the greatest impact stresses. Y

8. In ay machine ofthe class describedthe combination of a casinga rotor in said cas- 115 ing, said cas-ing` including a movably mounted Wall adjacent the path of saidrotor, rela- 1 tively movable meansiconnected` to said m0vably mounted Wall member, means cor-operating with# said relatively movable means to hold said Wall in. apredetermined relation to said rotor, and meanspositively to-hold said WallV and relatively movable means in fixed relation under normal operating strains and permit them to move relatively,'While 125 maintainingy their connected relation, under abnormal strains.

9. In av machine of the class. described,"the combination of a casing, a rotor in said casing,A said casing including a movably mount- 13e ed Wall adjacent the path of said rotor, relatively movable means connected to said movably mounted Wall member, means co-operating With said relatively movable means to hold said Wall ina predetermined relation to said rotor, and kfrangible means positively to hold said Wall and relatively movable means in fixed relation under normaloperating strains 4and permit them to move relatively, While maintaining their connected relation, under abnormal strains.

10. In a machine of the class described, the combination of a casing, a rotor in said casing, said casing including a pivotally mounted wall adjacent the path of said rotor, latch means positively to hold said wall in predetermined relation to saidvrotor under normal operating conditions, and means to alter such predetermined relation through said latch means, said latch means including a frangible element adapted to release it under abnormal strains.

In testimony whereof `I have hereunto set my hand.

STANLEY F, OSSING. 

